The first terrestrial plants had adaptations that allowed them to live outside water, such as cellulose in their cell wall, which gave them support and protection, an impermeable external layer called the cuticle, and the presence of pores called stomata that allowed gas and water exchange regulation.
First terrestrial plants were probably similar to liveworts, nonvascular plants. There are not many fossils of the first plants, except for their spores, which had protective coatings that allowed them to survive in their new dry environment.